You're being led by the nose by the "independent media" again.
There may well be too many office wallahs in the MoD and that probably costs too much, yes.
Setting that aside, people who work for the MoD have "pay and conditions," same as anyone else. Part of these is a bonus scheme. A common level of bonus is £1000 (so I'm told). That's not a hell of a lot over a year.
What you ranting goons don't realise is that for "rank and file" civil servants, bonus pay is a way of reducing pay, without the firm blatantly cutting basic rates. In theory, bonus is based on targets met and great work done, but actually, in a year when money is short and employees have nowhere else to go, it's pretty easy for the "firm" to cut bonuses, claiming that the staff haven't worked well enough.
Equating money people are paid with life-saving (or enemy life-ending) equipment not bought, is an easy headline-grabber, but if you employ people you do have to pay them something.